my recent reads..

LEAP#287 Ultrasonic Alarm

The HC-SR04 Ultrasonic Ranging Module is commonly used with a microcontroller for obstacle detection and other autonomous control functions. But that doesn’t mean it can’t be used in circuits that lack a processor. Silicon Chip featured an article by Jim Rowe in the Dec-2016 edition that described Using An Ultrasonic Sensor Module As A Door Sentry, so I built something similar! As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub


read more and comment..

LEAP#286 Low-side Power FET Switching

It’s a common question - how to switch high(er) voltage loads with a microcontroller that might only be running at 3.3 or 5V? Someone asked me to demonstrate, so I cobbled together this example of low-side switching with an n-channel enhancement mode MOSFET controlled by an Arduino running on 5V. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image


read more and comment..

LEAP#285 The Boldport Tap

The Tap is a Boldport Club retro reproduction of a lovely 7400-series logic circuit published in a 1974 Elektor article. It implements four touch-sensitive inputs and multiple outputs: logic-level and it’s complement, as well as open-collector equivalents able to sink greater current. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image


read more and comment..

LEAP#284 The Boldport Gent

Building The Gent, Boldport Club Project #10. A simple circuit on a beautiful board. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image


read more and comment..